Method of preparing MIM418 alloy through low-oxygen content mother alloy method

A low oxygen content, master alloy technology, applied in the field of powder metallurgy, can solve problems affecting product performance, achieve the effects of reducing sintering deformation, inhibiting volatilization, and ensuring element content

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a significant disadvantage in the master alloy method. Since the master alloy powder contains many active elements, and the alloy content is higher than that of the matrix powder, the oxygen in the powder migrates to the direction of the master alloy during the sintering process, and at the interface between the master alloy powder and the matrix powder Oxide segregation is formed on the surface, which affects product performance

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] The Ni-50wt.% Cr master alloy, Ni-5wt.% B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9%, as well as aluminum blocks, sponge titanium, and sponge zirconium, at 5vol.% Pretreatment is carried out in hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 30 minutes. After washing with alcohol, it is dried in an oven at 60°C for 60 minutes. 9.15Al-19.23Cr-6.62Mo-3.31Nb-1.15Ti-0.15Zr-0.02B-0.18C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep it warm for 10 minutes, then cool down, fill with argon,...

Embodiment 2

[0024] The Ni-50wt.% Cr master alloy, Ni-5wt.% B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9%, as well as aluminum blocks, sponge titanium, and sponge zirconium, at 5vol.% Pretreatment is carried out in hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 30 minutes. After washing with alcohol, it is dried in an oven at 60°C for 60 minutes. 9.15Al-19.23Cr-6.62Mo-3.31Nb-1.15Ti-0.15Zr-0.02B-0.18C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep it warm for 10 minutes, then cool down, fill with argon,...

Embodiment 3

[0026] The Ni-50wt.% Cr master alloy, Ni-5wt.% B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9%, as well as aluminum blocks, sponge titanium, and sponge zirconium, at 5vol.% Pretreatment is carried out in hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 30 minutes. After washing with alcohol, it is dried in an oven at 60°C for 60 minutes. 9.15Al-19.23Cr-6.62Mo-3.31Nb-1.15Ti-0.15Zr-0.02B-0.18C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep it warm for 10 minutes, then cool down, fill with argon,...

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Abstract

The invention discloses a method of preparing MIM418 alloy through a low-oxygen content mother alloy method. The method comprises the following steps: first, designing to obtain a mother alloy component, wherein the liquidus temperature of the mother alloy component is far lower than that of prealloy MIM418; preparing mother alloy powder through vacuum induction melting, electroslag remelting and mechanical disruption, mixing the mother alloy powder with nickel carbonyl powder and superfine graphite powder to obtain a mixture, uniformly mixing the mixture with a polyethylene glycol based water-soluble binder, and obtaining a part blank with a complicated shape through injection forming; and then, obtaining the high-performance MIM418 alloy through degreasing, vacuum sintering and thermal treatment. According to the invention, oxide segregation is reduced, oxygen content in a finished product and the oxygen content increased in the degreasing technology are reduced. During the vacuum sintering process, sintering deforming is reduced to control size precision through adjusting the heating rates of different temperature intervals. The cost and technological energy consumption of the raw material powder are remarkably reduced, the oxygen content and inclusion content of a superalloy part are effectively reduced, the oxygen content of a finished product is lower than 200 ppm, and the prepared superalloy is close to full-compact, uniform in organization structure and excellent in comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a method for preparing MIM418 alloy by a master alloy method with low oxygen content. Background technique [0002] The master alloy method is to prepare the alloy elements in the material into fine master alloy powder with high alloying degree, then mix the master alloy powder and the matrix element powder according to the corresponding ratio, and then sinter to form an alloy with uniform composition. This method improves the driving potential of atomic migration during sintering by increasing the powder specific surface area and lattice distortion, and increasing the chemical composition gradient between powders. Active, lower sintering temperature. Combining this method with the injection molding process can realize the near-net forming of superalloys, solve the problem of difficult forming and processing of superalloy parts with complex shapes, further improve production efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C19/05C22B9/18B22F9/04C22C1/05B22F3/22B22F3/10B22F3/15B22F3/24C22F1/10
CPCB22F3/1017B22F3/15B22F3/22B22F3/24B22F9/04B22F2003/248B22F2998/10C22B9/18C22C1/023C22C1/03C22C1/058C22C19/051C22C19/056C22F1/10B22F1/0003Y02P10/25
Inventor 曲选辉陈晓玮章林刘烨李向前单化杰秦明礼
Owner UNIV OF SCI & TECH BEIJING
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